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René Clément's Battle Of The Rails [Bataille du rail] (1946) - about railway workers as part of the resistance sabotaging the network to prevent German supplies.
On a slightly similar note there's John Frankenheimer's The Train (1964) with Burt Lancaster, which was based on resistance member, Rose Valland's book Le front de l'art.
Marie October (1959) where a group of resistance fighters meet up years after the war to work out which one of them was the traitor that got their leader killed. It's more of an Agatha Christie like whodunit than a war film so probably not quite what you're after but it is quite enjoyable.
On a slightly similar note there's John Frankenheimer's The Train (1964) with Burt Lancaster, which was based on resistance member, Rose Valland's book Le front de l'art.
Marie October (1959) where a group of resistance fighters meet up years after the war to work out which one of them was the traitor that got their leader killed. It's more of an Agatha Christie like whodunit than a war film so probably not quite what you're after but it is quite enjoyable.